Starspot Jitter in Photometry, Astrometry and Radial Velocity Measurements

Details Starspot Jitter in Photometry, Astrometry and Radial Velocity Measurements Starspot Jitter in Photometry, Astrometry and Radial Velocity Measurements

2009-11-10

arxiv.org/abs/0911.2008v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

accepted in ApJ Letters, Nov. 2009

Scientific paper

Analytical relations are derived for the amplitude of astrometric, photometric and radial velocity perturbations caused by a single rotating spot. The relative power of the star spot jitter is estimated and compared with the available data for $\kappa^1$ Ceti and HD 166435, as well as with numerical simulations for $\kappa^1$ Ceti and the Sun. A Sun-like star inclined at $i=90\degr$ at 10 pc is predicted to have a RMS jitter of 0.087 \uas in its astrometric position along the equator, and 0.38 m s$^{-1}$ in radial velocities. If the presence of spots due to stellar activity is the ultimate limiting factor for planet detection, the sensitivity of SIM Lite to Earth-like planets in habitable zones is about an order of magnitude higher that the sensitivity of prospective ultra-precise radial velocity observations of nearby stars.

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